In many references, mostly civil engineering, the second moment of area is referred as Moment of Inertia. Is that "really" correct? From my understanding, moment of inertia is analogous to mass in rotational motion, not the second moment of area.
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It is always told as a fact without explaining the reason. Why do two objects get charged by rubbing? Why one object get negative charge and...
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cosmology - The difference between comoving and proper distances in defining the observable universe"The radius of the observable universe is estimated to be about 46.5 Gly." If I understand correctly, it means the most distant ob...
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